what exactly are you expecting the spare RAM to do - calculations, string parsing, data look ups... tell you stories while you wait...

... RAM is just a dumb store, all the conversion WORK has to be done by the CPUs.... Duh!

Yes cybmole is right. This is what CPU bound means. Your CPUs are flat out and using as much RAM as they need. If you want to speed things up you need faster CPUs. Even if you could get them to use more RAM it will not help, because the CPUs are already going as fast as possible.

I'm not going to make a portable 64 bit version, 32-bits are portable, 64-bits are not. There are still lots of 32-bit windows systems around. You might be able to get it to work by manually replacing the contents of the Calibre folder in your 32 bit calibre portable directory with the contents of the the Calibre2 folder from a 64-bit calibre install.

I'm not quite sure I understand the logic behind the statement in the first sentence. That said, things do indeed seem to work by replacing the contents with the stuff from the 64-bit version.

All of the conversions were accomplished properly, and as the processes were eliminated to 3 cores processing, the fan speed slowed some, but 3 cores continued at 100%. RAM usage didn't change. It's the RAM usage that I need to improve, but I don't know how.

This must not be a problem with anyone else, for no one seems to have voiced a problem. However, I'd like, if possible, to improve this process. I just ordered an aftermarket cooler for the system that should keep the processors cool during the conversions, but, still.....DAD GUMMIT, I'd like to take advantage of all that extra RAM not doing anything!

One way could be to use a RAM disk. And put the temp folder there. I have done just that on my 16GB 8-core Bulldozer system. And I also have my Web browser cache there. I have a Linux system, so I don't really know how to do that in Windows.

If the CPU:s are running at 100 percent it doesn't mean that there isn't some room for improvement. It may be that a large portion of that percentage is used in context switching and handling slow disk writes and reads, instead of actual conversions. But I agree that there may not be a lot to gain. Still it may be fun to try.

It does help a bit, especially when doing large bulk conversions. But I very rarely do that, and when I do I don't mind a cup of coffee.

for your reply. I think you understand what I'm trying to say, albeit, somewhat ineffectively.

"Somewhat fun to try."

Yessir, that's EXACTLY the point. I'm not a programmer, as I'd iterated earlier in either this thread or another forum, I'm not sure, but I like to fiddle around with my computer, continually trying to get the most out of it. Calibre, bar none, is my favorite piece of software, all time favorite. And I've been using computers back pre-DOS 2.0, when the hard drive was a cassette tape and the programs were written in Basic. (Radio Shack, Color Computer II). Calibre has more features, more thoughfully created - user friendly and useful aspects, than any other program to which I've been exposed. Mr. Koval and his fellows inspire awe in my opinion, creating Calibre and continually improving it, and offering it free to all that wish to use it.

I someday want, badly, to build me a "bulldozer." For now, an aftermarket cooler will probably have to suffice. I thank all who entered this thread positively to try to assist me in my endeavor. The others? bleh

y'know, when Microsoft wrote Vista & then win 7, they thought to themselves why not use any spare RAM that's lying around, so they created intellifetch - which loads up otherwise empty RAM with potentially useful stuff, based on looking at your activity profile to guess what you may need next.

All it got them was a flood of complaints about how wasteful the new O/S was, & how XP was much better because it uses much less RAM

If that unused RAM really bugs you, you could, you know, take it out & send it to Africa to boost some poor kid's ageing rig over there, instead of having it sitting idle.

check that you are not trying to start both versions at once - that could be problematic!

Hmm, now that's an interesting question. Could one run both the 32 and 64 bit versions at once? Obviously, one wouldn't want them accessing the same library at the same time, but if they were accessing different libraries, would it work? I might have to give this a try at home, I could actually find a use for doing this.

Hmm, now that's an interesting question. Could one run both the 32 and 64 bit versions at once? Obviously, one wouldn't want them accessing the same library at the same time, but if they were accessing different libraries, would it work? I might have to give this a try at home, I could actually find a use for doing this.

default install paths will have them both using same app data folder. you'd be needing to tweak that I reckon.

First, I'd like to echo some of the other people in saying thank you for Calibre - it is one of the best and most useful programs I've ever used, and even better, it's free and open-source!

Like at least one other person who posted, after uninstalling the 32-bit version of Calibre and installing the 64-bit version, I was unable to set ebook-viewer.exe as a default program for any file type. In the selection dialogue, I would select the program and it would not appear on the list. After reading this thread, I searched through my registry and found several remaining entries referring to the old Calibre directory in C:\Program Files (x86)\. After I deleted all of these entries from the registry, I was then able to set the newly installed ebook viewer in the C:\Program Files\Calibre2\ directory as a default program like normal.

I have no idea why it wouldn't let me do that in the first place - perhaps there's some kind of bug in Windows 7 having to do with programs with the same file name in different directories? - but in any case, I was able to get it working.